Výsledky vyhledávání - "Sonia Esperança"

Geophysical and geochemical evidence for cold upper mantle beneath the Equatorial Atlantic Ocean

Autor: Sonia Esperança, Susanna Eleonora Sichel, Eliane da Costa Alves, Akihisa Motoki, Sidney L. M. Mello, Mary F. Horan, Peter Szatmari, Marcia Maia

Publikováno v: Revista Brasileira de Geofísica v.26 n.1 2008
Revista Brasileira de Geofísica
Sociedade Brasileira de Geofísica (SBG)
instacron:SBG
Revista Brasileira de Geofísica, Volume: 26, Issue: 1, Pages: 69-86, Published: MAR 2008

This paper presents geophysical and geochemical evidence for the possible existence of cold, subducted lithosphere beneath the Saint Paul Fracture Zone of the Equatorial Atlantic Ocean. The ocean floor along the fracture zone is characterized by a hi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e97d39573c646a3cbbb0dcab6e14f4a
https://doi.org/10.1590/s0102-261x2008000100006

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Rhyolites as probes of the crust: examples from Tertiary volcanism in Arizona, southwestern U.S.A

Autor: Sonia Esperança, Thomas C. Moyer

Publikováno v: Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 83:347-359

Geochemical and isotopic data obtained from three bimodal basalt-rhyolite fields in west-central Arizona point to significant variation in the sources of the siliceous products despite petrological similarities between them. The studied fields, which

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47a278e8cfa9d3e97000b78201839b76
https://doi.org/10.1017/s0263593300008014

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Rhyolites as probes of the crust: examples from Tertiary volcanism in Arizona, southwestern U.S.A

Autor: Thomas C. Moyer, Sonia Esperança

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e823a2e08eca25c7111033621900593c
https://doi.org/10.1130/spe272-p347

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Dating crust-mantle separation: Re-Os isotopic study of mafic xenoliths from central Arizona

Autor: Steven B. Shirey, Sonia Esperança, Douglas Smith, Richard W. Carlson

Publikováno v: Geology. 25:651

Mafic deep crustal and shallow upper mantle xenoliths hosted in the Chino Valley and Camp Creek latites of central Arizona have 187Os/188Os (0.216 to 1.51) ratios dramatically higher than values typical of mantle peridotite (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b25ab454d8a361d6ac44573d2b45b9c1
https://doi.org/10.1130/0091-7613(1997)025<0651:dcmsro>2.3.co

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Ultramafic xenoliths from the Mt. Carmel area (Karem Maharal Volcano), Israel

Autor: Sonia Esperança, Zvi Garfunkel

Publikováno v: Lithos. 19:43-49

A suite of xenoliths from the Mt. Carmel area, Israel, is predominantly composed of high-Al clinopyroxene + pyrope-almandine garnet + spinel ± plagioclase. Some garnet clinopyroxenites show exsolution features of the aluminous phases garnet, spinel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e9b3dd143e142a66ca18edc8e751010
https://doi.org/10.1016/0024-4937(86)90014-9

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The origin of the high-K latites from Camp Creek, Arizona: constraints from experiments with variable fO2 and $$a_{{\text{H}}_{\text{2}} {\text{O}}} $$

Autor: Sonia Esperança, John R. Holloway

Publikováno v: Contributions to Mineralogy and Petrology. 93:504-512

Near-liquidus melting experiments were performed on a high-K latite at fO2's ranging from iron-wustite-graphite (IWG) to nickel-nickel oxide (NNO) in the presence of a C-O-H fluid phase. Clinopyroxene is a liquidus phase under all conditions. At IWG

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f5797d6c5d7a3d3687727fedb3a1dc7a
https://doi.org/10.1007/bf00371720

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Lower crustal evolution under central Arizona: Sr, Nd and Pb isotopic and geochemical evidence from the mafic xenoliths of Camp Creek

Autor: Steven B. Shirey, Sonia Esperança, Richard W. Carlson

Publikováno v: Earth and Planetary Science Letters. 90:26-40

Oligocene potassic volcanism at the Camp Creek area, Arizona has sampled the lower crust by bringing mafic granulite, amphibolite and garnet-bearing pyroxenite (eclogite) xenoliths to the surface. Xenolith geobarometry records metamorphic pressures o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ec43985c5aa019593114078a940e63d
https://doi.org/10.1016/0012-821x(88)90108-2

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On the origin of some mica-lamprophyres: experimental evidence from a mafic minette

Autor: John R. Holloway, Sonia Esperança

Publikováno v: Contributions to Mineralogy and Petrology. 95:207-216

Experimental melting relationships for a mafic minette (mica-lamprophyre) from Buell Park, Arizona were determined under fO2 conditions equivalent to the ironwustite-graphite and quartz-fayalite-magnetite buffers, at pressures of 10–20 kbar. A comp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d249b991d49f2066df16a0c0292d7b97
https://doi.org/10.1007/bf00381270

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Lower Crustal Nodules from the Camp Creek Latite, Carefree, Arizona

Autor: John R. Holloway, Sonia Esperança

A suite of lower crustal nodules collected from the potassic latite (6.5% K2O) of the Camp Creek locality (16 km ENE of Carefree, Arizona) is comprised predominantly of eclogites, garnet clinopyroxenites and amphibolites. The nodule mineralogy consis

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::318209f9f1f21157d6bdc91a66765883
https://doi.org/10.1016/b978-0-444-42274-3.50024-x

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